Chipotle to give away free burritos for 20 years

Chipotle Mexican Grill is celebrating its 20th anniversary with a treasure hunt, in which the ultimate prize is free burritos for 20 years.

"Adventurrito" will take participants through a series of 20 online puzzles and daily prizes. It begins today.

During the first 19 days of the contest, Chipotle will be giving away free burritos for a year to 20 contestants. On the last day, the first 20 players who finish the puzzle first will be awarded the Grand Prize of free burritos for 20 years.